The culprits are described as two or three armed black males in their late teens to early 20s, with skinny builds, and wearing hooded sweatshirts.

One man is about 5 feet, 5 inches tall and the other man is approximately 6 feet tall. The men had handguns. Omaha Police Robbery Unit detectives believe that the group has committed up to 24 robberies in the Omaha area, and have gotten more and more aggressive with each one.

Every incident has involved a gun.

"They're putting them up to employees' heads, they're demanding money from the registers- and they're handling their weapons poorly," Sgt. Steve Fornoff with the Omaha Police Robbery Unit said. "We're worried that somebody is going to get killed from this group."

Last month, a clerk was shot in the leg in the process of a robbery at the 24th and Q Mega Saver.

"The clerk did everything they asked her to do, she gave them the money they requested, and then they shot her," Fornoff said.

Police are asking for help from residents and want citizens to be aware of their surroundings or any suspicious behavior near commercial businesses, along with keeping an eye on vehicles in their neighborhoods.

Fornoff says the police department has increased patrols around the areas where the robberies have been taking place, but that employees and customers need to be aware of their surroundings.

The robbers typically park in a nearby area and approach the targeted business on foot.

Police said the men should be considered armed and dangerous, and residents should not approach them or anyone acting suspicious. Instead, they should call 911.

Anyone with information about the robbers is asked to call Crime Stoppers at 402-444-STOP.